Light

Detailed requirement

Part 1: Melanopic Light Intensity for Work Areas

At least one of the following requirements is met:

• Light models or light calculations (which may incorporate daylight) show that at least 250 equivalent melanopic lux is present at 75% or more of workstations, measured on the vertical plane facing forward, 1.2 m [4 ft] above finished floor (to simulate the view of the occupant). This light level is present for at least 4 hours per day for every day of the year.

Part 2: Melanopic Light Intensity in Living Environments

In all bedrooms, bathrooms, and rooms with windows, one or more fixtures provide the following:

• 250 or more equivalent melanopic lux as measured facing the wall in the center of the room 1.2 m [4 ft] above the finished floor. The lights may be dimmed in the presence of daylight, but are able to independently achieve these levels.
• Evening lights provide not more than 50 equivalent melanopic lux as measured 0.76 m [30 inches] above the finished floor.

Part 3: Melanopic Light Intensity in Breakrooms

Workplaces where employees spend most of their time in spaces with light levels limited by work type (such as restaurant servers or hospital ward workers) have break rooms which meet the following requirement:

• Lights provide a maintained average of at least 250 equivalent melanopic lux as measured on the vertical plane facing forward at surfaces 1.2 m [4 ft] above finished floor.

Part 4: Melanopic Light Intensity in Learning Areas

At least one of the following requirements is met:

• From early education to adult education for students under 25 years of age: Light models (which may incorporate daylight) show that at least 125 equivalent melanopic lux is present at 75% or more of desks, on the vertical plane facing forward 1.2 m [4 ft] above finished floor. This light level is present for at least 4 hours per day for every day of the year.

See detailed requirement for Circadian Lighting Design